Why evidence alone does not create a compelling health product

Research can show that a given approach works under given conditions. How that approach finds a place in someone's life has to be designed separately.

This is where the product meets new questions: Whose need are we meeting? What can the user expect from us? What should they understand on first use? When should they take the next step, and when should they seek professional support?

The answers to these questions do not come straight out of a paper's conclusion.

The first job is to clarify what the evidence allows us to say.

Who took part in the study, how long the intervention lasted, which outcomes were measured and under what conditions the research ran — all of this shapes the product's promise. When a benefit seen in a specific group becomes a promise for everyone, communication carries more than the evidence can bear.

Product strategy is therefore as concerned with how we explain a claim's limits as with which claim we can make. A user who knows what to expect is where trust begins.

The second job is to connect the scientific result to the user's decision.

The accuracy of a measurement may matter to the user. But if they cannot tell what to do with the result on screen, the product experience is incomplete.

In an app that tracks a health marker, for instance, showing a number is only the start. What that number means, what can be inferred from a single measurement and when to seek support must also be clear.

Here, language, screen order and guidance are part of the product's function. Each one shapes how the user interprets the result.

The third job is to account for the distance between research conditions and everyday life.

Research may involve regular follow-up, clear instructions and support. In everyday life, users rush, take breaks, misunderstand steps or use the product for a different purpose than intended.

Strategy has to build these conditions into the design. How much time and attention we ask for, how many steps it takes to reach the benefit and how we help when the process breaks down are concrete product decisions.

Trust is built from the sum of these decisions.

Linking to a publication is valuable. Earning the user's trust also requires the product's own behaviour to be consistent: promises must be clear, uncertainty visible, data-use explanations understandable and guidance aligned with what was promised.

Evidence gives a product a solid foundation. Strategy decides for which user, which need and which experience that foundation becomes meaningful.

Building a good health product means turning a scientifically defensible approach into an experience people can understand, use and set the right expectations for.